UST Programs - LG 113

Issue Date: November 22, 1995
Revision Date: September 11, 1998

Xerxes Corp.

Xerxes Trucheck Hydrostatic Monitoring System

INTERSTITIAL TANK TIGHTNESS TEST METHOD

Certification	Leak rate of 0.1 gph with PD = 99% and PFA = 1%.
Leak Threshold	0.05 gph. A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.
Applicability	Gasoline, diesel, aviation fuel, fuel oil #4.
Tank Capacity	Maximum of 30,000 gallons. Tank must be between 0 to 100% full.
Waiting Time	None between delivery and testing.
Test Period	Minimum of 10 hours.
Groundwater	Depth to groundwater in tank excavation backfill must be determined before and after test. When groundwater level is above bottom of tank but below top, test should be repeated if groundwater level increases by more than 7 inches during test. When groundwater level is above tank, test should be repeated if groundwater level increases by more than 5 inches during test.

Xerxes Corp.	Evaluator: Robert Plunkett, Ph.D.
7901 Xerxes Ave.	Tel: (612) 338-0945
Minneapolis, MN 55431	Date of Evaluation: 01/07/93
Tel: (952) 887-1890
Web Address: www.xerxescorp.com

Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the performance of the method or equipment.
Equipment should be installed and operated in accordance with all applicable laws and regulations.
For full details, please refer to our expanded "DISCLAIMER" page.